[1] 8-4-2 is a "special set" of rules that for field goals, "trumps" other scrimmage kick rules.
[2] 3-1-3 is a "special set" of rules that for extra periods, "trumps" lots of other rules.
[3] 3-4-4 is a "special set" of rules that for fouls inside one minute, "trumps" 3-4-3.